JP6312236B2 - Method for producing single crystal diamond - Google Patents
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- 239000010432 diamond Substances 0.000 title claims description 145
- 229910003460 diamond Inorganic materials 0.000 title claims description 143
- 239000013078 crystal Substances 0.000 title claims description 130
- 238000004519 manufacturing process Methods 0.000 title claims description 37
- 239000000758 substrate Substances 0.000 claims description 220
- 238000000034 method Methods 0.000 claims description 51
- 230000002093 peripheral effect Effects 0.000 claims description 23
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 20
- 239000007789 gas Substances 0.000 description 19
- 239000000463 material Substances 0.000 description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 10
- 238000001308 synthesis method Methods 0.000 description 9
- 239000012808 vapor phase Substances 0.000 description 9
- 238000007493 shaping process Methods 0.000 description 8
- 238000001069 Raman spectroscopy Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005468 ion implantation Methods 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001237 Raman spectrum Methods 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Description
本発明は、単結晶ダイヤモンドの製造方法に関する。 The present invention relates to a method for producing single crystal diamond.
半導体として優れた特性を有するダイヤモンドは、高周波・高出力デバイス、受光デバイスなど半導体デバイス用の材料として期待されている。特に、ダイヤモンドを半導体材料として実用化するためには、大面積の均質な単結晶ダイヤモンドからなるウェハが必要である。 Diamond having excellent characteristics as a semiconductor is expected as a material for semiconductor devices such as high-frequency / high-power devices and light-receiving devices. In particular, in order to put diamond to practical use as a semiconductor material, a wafer composed of a large area of homogeneous single crystal diamond is required.
従来、単結晶ダイヤモンドの成長は、主に高圧合成法、気相合成法などの方法によって行われている。これらの方法の内で、高圧合成法は、１ｃｍ角程度の面積を有する基板の製造が限界とされており、これ以上の面積を有する単結晶基板を製造する方法としては期待できない。また、５ｍｍ角程度以上の面積を有する単結晶ダイヤモンド基板を入手することは困難であり、その面積を拡大することも容易ではない。 Conventionally, single crystal diamond is grown mainly by a method such as a high pressure synthesis method or a gas phase synthesis method. Among these methods, the high-pressure synthesis method is limited to the production of a substrate having an area of about 1 cm square, and cannot be expected as a method for producing a single crystal substrate having an area larger than this. In addition, it is difficult to obtain a single crystal diamond substrate having an area of about 5 mm square or more, and it is not easy to enlarge the area.
このため、大面積の単結晶ダイヤモンドを作製する方法として、同一表面上に並べた複数のダイヤモンド結晶上に気相法でダイヤモンド結晶を成長させて接合することによって、大型のダイヤモンド結晶とする、いわゆるモザイク状ダイヤモンドの作製技術が開発されている（非特許文献１）。 For this reason, as a method for producing a large-area single crystal diamond, a diamond crystal is grown on a plurality of diamond crystals arranged on the same surface by a vapor phase method and bonded to form a large diamond crystal. A technique for producing mosaic diamond has been developed (Non-patent Document 1).
モザイク状ダイヤモンドを製造する際に、接合すべき基材として単結晶ダイヤモンドのみを用いる場合と、単結晶ダイヤモンドと多結晶ダイヤモンド又はそれ以外の材料を用いる場合があるが、いずれの場合にも、これらの基材の上に気相法によってダイヤモンドを成長させることによって、基材となるダイヤモンドを接合している。 When manufacturing mosaic diamond, there are cases where only single crystal diamond is used as the base material to be joined, and there are cases where single crystal diamond and polycrystalline diamond or other materials are used. The diamond as the base material is bonded to the base material by growing the diamond by a vapor phase method.
これらの方法の内で、単結晶ダイヤモンド基板のみを用い、これを接合して大型の単結晶ダイヤモンドを得る方法としては、例えば、接合しようとする単結晶ダイヤモンド基板の間隔や高さの差を所定の範囲内に収め、その上に一体のダイヤモンド結晶を気相成長させることによって、基板と基板の境界部に成長する異常成長粒子の発生を抑制して大型ダイヤモンド結晶を製造する方法が報告されている（特許文献１）。 Among these methods, only a single crystal diamond substrate is used and bonded to obtain a large single crystal diamond. For example, a gap between single crystal diamond substrates to be bonded and a difference in height are predetermined. A method for producing a large diamond crystal by suppressing the generation of abnormally grown particles growing at the boundary between the substrate by vapor-phase-growing an integral diamond crystal on the substrate is reported. (Patent Document 1).
更に、基材とする単結晶ダイヤモンドのオフ角やオフ方向を適切に選択し、この単結晶ダイヤモンドを複数個並べて配置し、その後、気相合成法によって隣り合う単結晶の方向へ優先的にダイヤモンド結晶を拡大し、接合を促す方法も提案されている（特許文献２）。 Furthermore, the off-angle and off-direction of the single crystal diamond used as the base material are appropriately selected, and a plurality of the single crystal diamonds are arranged side by side, and then the diamond is preferentially arranged in the direction of the adjacent single crystal by the vapor phase synthesis method. A method of enlarging crystals and promoting bonding has also been proposed (Patent Document 2).
更に、接合しようとする側面としてヘキ開面を用いる方法、接合しようとする側面に角度を設ける方法等も知られている（特許文献３及び４）。 Furthermore, a method using a cleaved surface as a side surface to be joined, a method of providing an angle on the side surface to be joined, and the like are also known (Patent Documents 3 and 4).
ところで、気相合成法を用いたホモエピタキシャル成長によってダイヤモンド基板上に単結晶ダイヤモンドを成長させる方法は、例えば、半導体グレードの高品質ダイヤモンドの合成に適用されている。しかしながら、気相合成法によるダイヤモンドのエピタキシャル成長においては、多数の異常成長粒子や成長丘などの欠陥が発生し易く、大面積の単結晶ダイヤモンドの合成は容易ではない。 By the way, a method of growing single crystal diamond on a diamond substrate by homoepitaxial growth using a vapor phase synthesis method is applied to, for example, synthesis of semiconductor-grade high-quality diamond. However, in the epitaxial growth of diamond by the vapor phase synthesis method, defects such as a large number of abnormally grown particles and growth hills are likely to occur, and it is not easy to synthesize large-area single crystal diamond.
同様に、基板表面上の欠陥は成長層にも引き継がれ、その位置を基板毎に制御することは不可能であるため、成長層の性質を統一することを妨げる原因の１つとなっている。更に、成長層の性質は、成長前の基板中に存在するひずみにも影響を受けることが知られている（非特許文献２）。 Similarly, defects on the surface of the substrate are inherited by the growth layer, and it is impossible to control the position of each substrate for each substrate, which is one of the causes that hinder the unification of the properties of the growth layer. Furthermore, it is known that the properties of the growth layer are affected by strain existing in the substrate before growth (Non-patent Document 2).
通常、複数のダイヤモンド結晶上に気相法でダイヤモンド結晶を成長させてモザイク状ダイヤモンドを作製する方法では、接合しようとするダイヤモンド基板のオフ角を同一とみなす閾値は最低でも１°以上とされている。しかしながら、１°でもオフ角が異なると同一の条件では成長層の品質が異なるものとなり、この方法で接合されたモザイク基板上には、接合された単結晶領域毎に品質の異なる単結晶層が成長することになる。また、前述したオフ角やオフ方向といった結晶面の方向が異なる基板を積極的に利用し、これら同士を接合してモザイク基板を製造する方法（特許文献２）についても同様の問題がある。 Usually, in the method of producing a mosaic diamond by growing diamond crystals on a plurality of diamond crystals by a vapor phase method, the threshold for considering the off angles of the diamond substrates to be bonded to be the same is at least 1 ° or more. Yes. However, if the off-angle is different even at 1 °, the quality of the growth layer will be different under the same conditions, and on the mosaic substrate joined by this method, single crystal layers having different qualities for each joined single crystal region. Will grow. In addition, there is a similar problem in the method (Patent Document 2) in which a mosaic substrate is manufactured by actively using substrates having different crystal plane directions such as the off angle and the off direction described above.
また、ダイヤモンドを半導体デバイス用の材料として用いる際には、通常、不純物を意図的に添加して基板（ダイヤモンドウェハ）上にダイヤモンドを成長させるが、その際の不純物の成長層への取り込み率やそれに伴う結晶性の変化は、基板の性質に依存することが知られている（非特許文献３）。従って、上記した方法を用いて大面積を有するダイヤモンドウェハが得られたとしても、オフ角、オフ方向といった結晶面の方向、ひずみや欠陥の分布等が不均一なウェハであれば、その上に作製されるデバイスは特性が不均一となることが予想される。従って、このような性質の揃っていないモザイクウェハを基板とし
て使用したとしても、実効的に使用に耐えうるデバイスが取り出される率が極めて低いことは明白である。更に、モザイク状ダイヤモンド基板は、デバイス作製のための処理に耐えうる様に強度を持つ必要があるため、接合した後に更にその上へ積み増す必要が生ずる場合がある。その際にも接合すべき基材として用いた単結晶ダイヤモンドの性質が異なると、均質に積み増すことが困難となる。
In addition, when diamond is used as a material for a semiconductor device, usually, impurities are intentionally added to grow diamond on a substrate (diamond wafer). It is known that the change in crystallinity accompanying this depends on the properties of the substrate (Non-patent Document 3). Therefore, even if a diamond wafer having a large area is obtained by using the above-described method, if the wafer has non-uniform crystal plane direction such as off-angle and off-direction, strain and defect distribution, etc. The fabricated device is expected to have non-uniform characteristics. Therefore, it is clear that even when a mosaic wafer having such properties is used as a substrate, the rate at which devices that can effectively withstand use are taken out is extremely low. Furthermore, the mosaic diamond substrate needs to have strength so that it can withstand the processing for device fabrication, and thus it may be necessary to further pile up after joining. Even in this case, if the properties of the single crystal diamond used as the base material to be joined are different, it becomes difficult to accumulate uniformly.
以上の様な困難さから、従来のモザイク状ダイヤモンド基板は、接合境界に沿って異常成長を抑制することが困難で、当該境界が滑らかに接合されておらず、接合された基板がヘキ開によって破壊することが開示されており（非特許文献１）、測定するまでもなく結晶性も粗悪である。 Due to the above difficulties, it is difficult for the conventional mosaic diamond substrate to suppress abnormal growth along the bonding boundary, and the boundary is not smoothly bonded. Disruption is disclosed (Non-patent Document 1), and the crystallinity is poor without being measured.
このような問題点を解決することを目的とした、大面積のダイヤモンド基板を製造する方法として、イオン注入を用いた自立膜作製方法を利用した方法が知られている（特許文献５）。この様な方法を用いれば、オフ角・オフ方向が揃った基板同士を容易に接合できると期待される。 As a method of manufacturing a large-area diamond substrate for the purpose of solving such problems, a method using a self-supporting film manufacturing method using ion implantation is known (Patent Document 5). If such a method is used, it is expected that substrates having the same off angle and off direction can be easily joined together.
しかしながら、本文献には複数の単結晶ダイヤモンド間のオフ方向が一致していることは記載されているものの、各々の単結晶ダイヤモンドのオフ方向と接合する基板との方向の関係については何ら記載されていない。 However, although this document describes that the off directions of a plurality of single crystal diamonds coincide with each other, there is no description about the relationship between the off direction of each single crystal diamond and the direction of the substrate to be bonded. Not.
例えば、特許文献５に記載される方法は大面積ダイヤモンド基板の製造方法としては優れているものの、オフ方向と接合する基板との方向の関係が適切で無い場合、得られた単結晶ダイヤモンド基板の接合領域に対応する部分は完全に滑らかに被覆されているとはいい難く、実用性に乏しいという問題点が生じている。例えば、接合領域の被覆の完全性が低い場合、研磨などの加工プロセスを実施することが困難となり、半導体ウェハとして使用することが困難となる。 For example, although the method described in Patent Document 5 is excellent as a method for producing a large-area diamond substrate, if the relationship between the off direction and the direction of the substrate to be bonded is not appropriate, the obtained single crystal diamond substrate It is difficult to say that the portion corresponding to the joining region is completely smoothly covered, and there is a problem that the practicality is poor. For example, when the integrity of the covering of the bonding region is low, it is difficult to perform a processing process such as polishing, and it is difficult to use the semiconductor wafer as a semiconductor wafer.
以上の様な理由から、単結晶ダイヤモンドからなる大面積の基板については、その要望が高いにもかかわらず、実用性に耐え得るものは未だ得られるに至っていない。よって、本発明は接合面の結晶学的性質が優れた単結晶ダイヤモンド基板を提供する事を目的とする。 For the reasons described above, a substrate having a large area made of single crystal diamond has not yet been obtained that can withstand practicality even though the demand is high. Therefore, an object of the present invention is to provide a single crystal diamond substrate having excellent crystallographic properties of the joint surface.
本発明者は、斯かる目的を達成すべく鋭意研究を重ねた結果、単結晶ダイヤモンドを製造する際の材料となる、同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板であって、斯かる種基板のオフ方向と該種基板の稜線のなす角度が、特定の範囲となるように該種基板の主たる成長面の外周側面が整形加工された複数の種基板を、支持台上に、互いの整形加工された該種基板の側面同士が接触し、該種基板のオフ方向を一致させ、且つ該種基板の主たる成長面が露出する状態となるように載置することにより、接合領域の結晶学的性質が優れた単結晶ダイヤモンド基板が製造できることを見出した。 As a result of intensive studies to achieve such an object, the present inventor is a plurality of single crystal diamond seed substrates having the same crystallographic properties, which are materials for producing single crystal diamond, A plurality of seed substrates whose outer peripheral side surfaces of the main growth surface of the seed substrate are shaped so that the angle between the off direction of the seed substrate and the ridge line of the seed substrate falls within a specific range are placed on a support base. The side surfaces of the seed substrates that have been shaped with each other are brought into contact with each other, the off-directions of the seed substrates are matched, and the seed substrate is placed so that the main growth surface is exposed. It has been found that single crystal diamond substrates with excellent region crystallographic properties can be produced.
本発明は、斯かる知見に基づいて完成されたものであり、以下に示す態様の発明を広く包含するものである。 The present invention has been completed based on such findings, and broadly encompasses the inventions of the embodiments shown below.
項１ 下記の工程を含む単結晶ダイヤモンド基板の製造方法：
（１）同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板であって、該種基板のオフ方向と該種基板の稜線のなす角が１７度より大きく、９０度以下となるように該種基板の主たる成長面の外周側面が整形加工された複数の種基板を、支持台上に、互いの整形加工された該種基板の側面同士が接触し、該種基板の結晶面のオフ方向を一致させ、且つ該種基板の主たる成長面が露出する状態となるように載置する工程、
（２）上記（１）工程で支持台上に載置された複数の種基板の主たる成長面上に単結晶ダイヤモンドを成長させる工程、及び
項２ 工程（１）における同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板のオフ方向と該種基板の稜線のなす角が１８度以上となるように該種基板の主たる成長面の外周側面が整形加工された、項１に記載の単結晶ダイヤモンド基板の製造方法。
Item 1 A method for producing a single crystal diamond substrate comprising the following steps:
(1) A plurality of single crystal diamond seed substrates having the same crystallographic properties, wherein an angle formed by an off direction of the seed substrate and a ridge line of the seed substrate is greater than 17 degrees and less than 90 degrees A plurality of seed substrates whose outer peripheral side surfaces of the main growth surface of the seed substrate are shaped are brought into contact with each other on the support base, and the side surfaces of the seed substrates that have been shaped are in contact with each other. A step of placing the seed substrates so as to be in a state where the main growth surface of the seed substrate is exposed;
(2) The step of growing single crystal diamond on the main growth surface of the plurality of seed substrates placed on the support table in the step (1), and the same crystallographic property in the step (1) The single crystal according to Item 1, wherein the outer peripheral side surface of the main growth surface of the seed substrate is shaped so that an angle formed between an off direction of the plurality of single crystal diamond seed substrates and an edge line of the seed substrate is 18 degrees or more. A method for producing a crystalline diamond substrate.
項３ 工程（１）における同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板のオフ方向と該種基板の稜線のなす角が８９度以下となるように該種基板の主たる成長面の外周側面が整形加工された、項１又は２に記載の単結晶ダイヤモンド基板の製造方法。 Item 3 The main growth surface of the seed substrate so that the angle between the off direction of the plurality of single crystal diamond seed substrates having the same crystallographic properties in step (1) and the ridge line of the seed substrate is 89 degrees or less. Item 3. The method for producing a single crystal diamond substrate according to Item 1 or 2, wherein an outer peripheral side surface is shaped.
項４ 結晶学的性質が、オフ方向及び／又はオフ角である項１〜３の何れか１項に記載の単結晶ダイヤモンド基板の製造方法。 Item 4. The method for producing a single crystal diamond substrate according to any one of Items 1 to 3, wherein the crystallographic property is an off direction and / or an off angle.
項５ 項１〜４の何れか１項に記載の方法によって得られる単結晶ダイヤモンド基板。 Item 5 A single crystal diamond substrate obtained by the method according to any one of Items 1 to 4.
項６ 項５に記載の単結晶ダイヤモンド基板であって、接合領域上におけるラマンシフト値の半値幅が、０ｃｍ−１より大きく１０ｃｍ−１である単結晶ダイヤモンド基板。 A single crystal diamond substrate according to claim 6 wherein 5, half-width, single-crystal diamond substrate which is a larger 10 cm -1 than 0 cm -1 Raman shift values on the junction region.
項７ 項５又は６に記載の単結晶ダイヤモンド基板であって、接合領域におけるＸ線のロッキングカーブの半値幅が、０秒より大きく１５０秒以下である単結晶ダイヤモンド基板。 Item 7 The single crystal diamond substrate according to Item 5 or 6, wherein the half-value width of the X-ray rocking curve in the bonding region is greater than 0 seconds and 150 seconds or less.
項８ 窒素含有量が０ｐｐｍより大きく１００ｐｐｍ以下である、項５〜７の何れか１項に記載の単結晶ダイヤモンド基板。 Item 8 The single crystal diamond substrate according to any one of Items 5 to 7, wherein the nitrogen content is greater than 0 ppm and 100 ppm or less.
以下に、本発明の単結晶ダイヤモンド製造方法が発揮する効果について詳述するが、本発明は、以下のすべての効果を有する発明に限定されないのは言うまでもない。 Although the effect which the single-crystal diamond manufacturing method of this invention exhibits below is explained in full detail below, it cannot be overemphasized that this invention is not limited to the invention which has all the following effects.
本発明の製造方法によると、得られた単結晶ダイヤモンド基板の接合領域の結晶学的性質が良好であるために、これを種基板として用い、更に大面積の単結晶ダイヤモンド基板を製造することが可能である。 According to the manufacturing method of the present invention, since the crystallographic properties of the bonding region of the obtained single crystal diamond substrate are good, it can be used as a seed substrate to manufacture a single crystal diamond substrate having a larger area. Is possible.
また、本発明の製造方法によると、得られた単結晶ダイヤモンド基板は接合領域であっても、比較的一様なモフォロジ―が得られるため、超難加工材料であるダイヤモンドの加工における負担を軽減することが可能である。 In addition, according to the manufacturing method of the present invention, since the obtained single crystal diamond substrate has a relatively uniform morphology even in the bonded region, the burden on processing of diamond, which is an extremely difficult processing material, is reduced. Is possible.
単結晶ダイヤモンド基板の製造方法
本発明に係る単結晶ダイヤモンド基板の製造方法は、下記の工程１及び工程２を含む。
（１）同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板であって、該種基板のオフ方向と該種基板の稜線のなす角が１７度より大きく、９０度以下となるように該種基板の主たる成長面の外周側面が整形加工された複数の種基板を、支持台上に、互いの整形加工された該種基板の側面同士が接触し、該種基板の結晶面のオフ方向を一致させ、且つ該種基板の主たる成長面が露出する状態となるように載置する工程、
（２）上記（１）工程で支持台上に載置された複数の種基板の主たる成長面上に単結晶ダイヤモンドを成長させる工程。
Method for Manufacturing Single Crystal Diamond Substrate A method for manufacturing a single crystal diamond substrate according to the present invention includes the following Step 1 and Step 2.
(1) A plurality of single crystal diamond seed substrates having the same crystallographic properties, wherein an angle formed by an off direction of the seed substrate and a ridge line of the seed substrate is greater than 17 degrees and less than 90 degrees A plurality of seed substrates whose outer peripheral side surfaces of the main growth surface of the seed substrate are shaped are brought into contact with each other on the support base, and the side surfaces of the seed substrates that have been shaped are in contact with each other. A step of placing the seed substrates so as to be in a state where the main growth surface of the seed substrate is exposed;
(2) A step of growing single crystal diamond on a main growth surface of a plurality of seed substrates placed on a support base in the step (1).
＜工程１について＞
本発明に係る単結晶ダイヤモンド基板の製造方法における工程１は、同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板であって、該種基板のオフ方向と該種基板の稜線のなす角が１７度より大きく、９０度以下となるように該種基板の主たる成長面の外周側面が整形加工された複数の種基板を、支持台上に、互いの整形加工された該種基板の側面同士が接触し、該種基板の結晶面のオフ方向を一致させ、且つ該種基板の主たる成長面が露出する状態となるように載置する工程である。以下に、上記工程１について詳述する。
<About Step 1>
Step 1 in the method for producing a single crystal diamond substrate according to the present invention includes a plurality of single crystal diamond seed substrates having the same crystallographic properties, wherein an angle formed between an off direction of the seed substrate and a ridge line of the seed substrate. A plurality of seed substrates whose outer peripheral side surfaces of the main growth surface of the seed substrate are shaped so as to be larger than 17 degrees and 90 degrees or less are formed on the support base, and the side surfaces of the seed substrates that are shaped with each other This is a step of placing the seed substrates so that they are in contact with each other, the off-directions of the crystal planes of the seed substrate are matched, and the main growth surface of the seed substrate is exposed. Below, the said process 1 is explained in full detail.
［同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板］
同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板の入手方法は、特に限定されず、市販の単結晶ダイヤモンド基板から同一の結晶学的性質を有する複数の単結晶ダイヤモンド基板を選別するか、公知のダイヤモンド製造方法を適宜採用し、同一の結晶学的性質を有する単結晶ダイヤモンド基板を製造すればよく、特に限定はされない。
[Multiple single crystal diamond seed substrates having the same crystallographic properties]
The method for obtaining a plurality of single crystal diamond seed substrates having the same crystallographic properties is not particularly limited, and is it possible to select a plurality of single crystal diamond substrates having the same crystallographic properties from commercially available single crystal diamond substrates? Any known diamond production method may be employed as appropriate to produce a single crystal diamond substrate having the same crystallographic properties, and is not particularly limited.
例えば、同一の結晶学的性質を有する複数の単結晶ダイヤモンド基板を得る方法として、以下に示すクローン基板の作製技術が挙げられる。この作製技術は、ダイヤモンド単結晶親基板の表面近傍にイオン注入して非ダイヤモンド層を形成し、次いで、該非ダイヤモンド層をエッチングして、該非ダイヤモンド層より上層の単結晶ダイヤモンド層を分離する工程によって子基板を得る技術である。具体的には、特許第４３４０８８１号、特開平２００７―１１２６３７、ＷＯ２０１１／０７４５９９、特開２０１０−１５００６９号公報等の記載を参照すればよい。 For example, as a method for obtaining a plurality of single crystal diamond substrates having the same crystallographic properties, a clone substrate manufacturing technique shown below can be cited. This manufacturing technique is a process in which a non-diamond layer is formed by ion implantation near the surface of a diamond single crystal parent substrate, and then the non-diamond layer is etched to separate a single-crystal diamond layer above the non-diamond layer. This is a technique for obtaining a sub board. Specifically, descriptions in Japanese Patent No. 4340881, Japanese Patent Application Laid-Open No. 2007-112737, WO 2011/074599, Japanese Patent Application Laid-Open No. 2010-150069, and the like may be referred to.
この技術によって得られる子基板は、親基板と同一の結晶学的性質を有しているため、同一の親基板に対して上述の工程を繰り返し採用することにより、同一の結晶学的性質を有する複数の子基板、即ちクローン基板を効率的に得ることができる。 Since the child substrate obtained by this technique has the same crystallographic properties as the parent substrate, it has the same crystallographic properties by repeatedly adopting the above steps for the same parent substrate. A plurality of child boards, that is, clone boards can be obtained efficiently.
このような複数の子基板（クローン基板）を、本発明の製造方法における、同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板とすればよい。 Such a plurality of sub-substrates (clone substrates) may be a plurality of single-crystal diamond seed substrates having the same crystallographic properties in the production method of the present invention.
なお、上記結晶学的性質とは、例えばオフ角、オフ方向等の結晶面の方向；ひずみ、欠陥の分布等が挙げられる。好ましくは、オフ角及び／又はオフ方向である。 The crystallographic properties include, for example, crystal plane directions such as off angle and off direction; strain, defect distribution, and the like. The off angle and / or the off direction are preferable.
［種基板の主たる成長面の外周側面の整形加工］
上記複数の単結晶ダイヤモンド種基板は、該種基板のオフ方向と該種基板の稜線のなす角が１７度より大きく、９０度以下となるように該種基板の主たる成長面の外周側面が整形加工されている。
[Shaping of the outer peripheral side of the main growth surface of the seed substrate]
In the plurality of single crystal diamond seed substrates, the outer peripheral side surface of the main growth surface of the seed substrate is shaped so that the angle between the off direction of the seed substrate and the ridge line of the seed substrate is greater than 17 degrees and less than 90 degrees. Has been processed.
該種基板のオフ方向と該種基板の稜線のなす角度の下限値は１７度よりも大きい数値である。好ましくは１８度以上であり、より好ましくは２０度以上、さらに好ましく２５度以上、最も好ましくは３０度以上である。 The lower limit value of the angle formed between the off direction of the seed substrate and the ridge line of the seed substrate is a value larger than 17 degrees. The angle is preferably 18 degrees or more, more preferably 20 degrees or more, further preferably 25 degrees or more, and most preferably 30 degrees or more.
また、上述の角度の上限値は９０度以下である。好ましくは９０度未満であり、より好ましくは８９度以下、さらに好ましくは８０度以下、さらに好ましくは７５度以下、最も好ましくは４５度以下である。 Further, the upper limit value of the angle is 90 degrees or less. The angle is preferably less than 90 degrees, more preferably 89 degrees or less, further preferably 80 degrees or less, further preferably 75 degrees or less, and most preferably 45 degrees or less.
即ち、前記種基板のオフ方向と該種基板の稜線がなす角度は、１７度よりも大きく、９０度以下であり、好ましくは、１８度以上９０度未満、１８度以上８９度以下、１８度以上８０度以下、１８度以上７５度以下、１８度以上４５度以下、２０度以上９０度未満、２０度以上８９度以下、２０度以上８０度以下、２０度以上７５度以下、２０度以上４５度以下、２５度以上９０度未満、２５度以上８９度以下、２５度以上８０度以下、２５度以上７５度以下、２５度以上４５度以下、３０度以上９０度未満、３０度以上８９度以下、３０度以上８０度以下、３０度以上７５度以下が挙げられ、最も好ましくは３０度以上４５度以下である。 That is, the angle formed between the off direction of the seed substrate and the ridge line of the seed substrate is greater than 17 degrees and 90 degrees or less, preferably 18 degrees or more and less than 90 degrees, 18 degrees or more and 89 degrees or less, 18 degrees 80 degrees or less, 18 degrees or more and 75 degrees or less, 18 degrees or more and 45 degrees or less, 20 degrees or more and less than 90 degrees, 20 degrees or more and 89 degrees or less, 20 degrees or more and 80 degrees or less, 20 degrees or more and 75 degrees or less, 20 degrees or more 45 degrees or less, 25 degrees or more and less than 90 degrees, 25 degrees or more and 89 degrees or less, 25 degrees or more and 80 degrees or less, 25 degrees or more and 75 degrees or less, 25 degrees or more and 45 degrees or less, 30 degrees or more and less than 90 degrees, 30 degrees or more and 89 degrees Degrees or less, 30 degrees or more and 80 degrees or less, 30 degrees or more and 75 degrees or less, and most preferably 30 degrees or more and 45 degrees or less.
なお、前記種基板のオフ方向と該種基板の稜線のなす角度が９０度以上から１８０度である場合は、本発明においてはその捕角に換算したものとして定義される。なお、この様に換算した本願発明にて規定する角度が、負の角度又は１８０度を超える場合となっても、これが０度から９０度の間に換算されることは言うまでもない。 In addition, when the angle formed by the off direction of the seed substrate and the ridge line of the seed substrate is 90 degrees or more and 180 degrees, the angle is defined as being converted into the catch angle in the present invention. In addition, even if the angle prescribed | regulated by this invention converted in this way exceeds a negative angle or 180 degree | times, it cannot be overemphasized that this is converted between 0 degree | times and 90 degree | times.
上述の種基板の主たる成長面とは、斯かる種基板中で最も面積の大きい面とも解することができる。或いは、気相合成法等の方法で単結晶ダイヤモンドを成長させる際に、放電領域に接する面を主たる成長面としてもよい。 The above-mentioned main growth surface of the seed substrate can also be understood as a surface having the largest area in the seed substrate. Alternatively, when single crystal diamond is grown by a method such as a vapor phase synthesis method, a surface in contact with the discharge region may be a main growth surface.
例えば上記［同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板の入手］にて例示した、クローン基板の製造方法によって得た複数の単結晶ダイヤモンド種基板であれば、親基板から分離された面又はその対面である。 For example, a plurality of single crystal diamond seed substrates obtained by the method for producing a clone substrate exemplified in [Obtaining a plurality of single crystal diamond seed substrates having the same crystallographic properties] are separated from the parent substrate. Or facing each other.
上述の外周側面とは、上述の主たる成長面又はその対面以外の面であり、複数存在してもよい。整形加工に供される外周側面は、これらの面のうち少なくとも１つの面であればよい。 The above-described outer peripheral side surface is a surface other than the above-described main growth surface or the opposite surface, and a plurality of the outer peripheral side surfaces may exist. The outer peripheral side surface used for shaping may be at least one of these surfaces.
上述の稜線とは上述の主たる成長面の外周側面が整形加工工程に供されて得られる側面と、上述の主たる成長面又はその対面との交線を意味する。 The above-mentioned ridge line means an intersection line between the side surface obtained by subjecting the outer peripheral side surface of the main growth surface to the shaping process and the main growth surface or the opposite surface.
具体的に供される整形加工の方法は特に限定はされず、例えば、スカイフ研磨等の研磨加工や、レーザーカット等の切断加工などの方法を採用したものが挙げられる。 The shaping method that is specifically provided is not particularly limited, and examples thereof include a method that employs a method such as a polishing process such as Skyf polishing or a cutting process such as laser cutting.
なお、後述する様に、上述の同一の結晶学的性質を有する複数の種基板は、該種基板の側面同士が接触するように載置するので、該側面がほぼ平面となるように研磨等によって整形加工されていることが好ましい。 As will be described later, the plurality of seed substrates having the same crystallographic properties described above are placed so that the side surfaces of the seed substrates are in contact with each other, so that the side surfaces are substantially flat. It is preferable that the shaping process is performed.
また、同一の結晶学的性質を有する複数の種基板のオフ方向と、整形加工に供されて得られる前記稜線とのなす角度が１７度より大きく、９０度以下となる外周側面を、後述するように該種基板の側面同士が接触し、且つ該種基板同士のオフ方向が一致する限りにおいて、該種基板の主たる成長面又はその対面と整形加工に供されて得られる該外周側面が、必ずしも垂直の関係となるようにされている必要は無く、例えば両者のなす角度が４５度〜１３５度程度の角度を有していてもよい。 In addition, an outer peripheral side surface in which an angle formed between an off direction of a plurality of seed substrates having the same crystallographic properties and the ridge line obtained by shaping is greater than 17 degrees and equal to or less than 90 degrees will be described later. Thus, as long as the side surfaces of the seed substrates are in contact with each other and the off directions of the seed substrates are matched, the outer peripheral side surface obtained by subjecting the main growth surface of the seed substrate or its opposite surface to shaping processing, The vertical relationship is not necessarily required. For example, the angle between the two may be an angle of about 45 degrees to 135 degrees.
なお、上述の同一の結晶学的性質を有する複数の種基板を、上述のようなクローン基板の作製技術によって得た子基板を採用する場合は、親基板のオフ方向を測定し、該オフ方向と、１７度より大きく９０度以下となる前記稜線が得られるように該親基板の主たる成長面の外周側面を、上述した方法によって整形加工し、これを親基板として作製されたクローン基板を本発明の整形加工後の同一の結晶学的性質を有する複数の種基板とすることもできる。 In the case where a plurality of seed substrates having the same crystallographic properties described above are adopted as the sub-substrate obtained by the clone substrate manufacturing technique as described above, the off direction of the parent substrate is measured, and the off direction is determined. Then, the outer peripheral side surface of the main growth surface of the parent substrate is shaped by the above-described method so as to obtain the ridge line that is greater than 17 degrees and equal to or less than 90 degrees. It can also be a plurality of seed substrates having the same crystallographic properties after the shaping of the invention.
なお、この場合、上述の親基板の主たる成長面の外周側面のうち、少なくとも一対の対面の距離が一定となるように整形加工される必要があり、例えば、少なくとも一対の対面が平行となるように整形加工されることが好ましい。 In this case, it is necessary to shape the outer peripheral side surfaces of the main growth surface of the parent substrate so that at least the distance between the pair of facing surfaces is constant. For example, at least the pair of facing surfaces are parallel to each other. It is preferable to be formed into a shape.
また、複数の種基板の厚さは、同一であっても異なっていてもよい。厚さは上述のクローン基板の取得技術を適宜採用することによって、得ることができる。又は、研磨処理に供して、厚さを適宜調整することも可能である。 Further, the thicknesses of the plurality of seed substrates may be the same or different. The thickness can be obtained by appropriately employing the above-described clone substrate acquisition technique. Alternatively, the thickness can be appropriately adjusted by polishing.
なお、種基板の厚さが同一とは、全ての種基板の厚さが完全に同一でなくてもよく、厚さの差が、２０μｍ程度以下の範囲内であれば、同一とみなすことができる。 It should be noted that the thickness of the seed substrate is not necessarily the same for all the seed substrates, and may be regarded as the same if the difference in thickness is within a range of about 20 μm or less. it can.
［複数の種基板の支持台上での載置］
本発明の製造方法における工程１では、主たる成長面の外周側面が整形加工された上述の複数の種基板を、支持台上に、互いの整形加工された該種基板の側面同士が接触し、該種基板の結晶面のオフ方向を一致させ、且つ該種基板の主たる成長面が露出する状態となるように載置する。
[Placing multiple seed substrates on a support stand]
In step 1 in the production method of the present invention, the plurality of seed substrates on which the outer peripheral side surfaces of the main growth surface are shaped are contacted with each other on the support table, and the side surfaces of the seed substrates that are shaped on each other are in contact with each other. The seed substrate is placed so that the crystal planes of the seed substrate are aligned with each other, and the main growth surface of the seed substrate is exposed.
具体的に、図１に示す模式図を用いて種基板のオフ方向と該種基板の稜線のなす角について説明する。図１は上述した複数の単結晶ダイヤモンド種基板を２枚並べた時の平面図であり、主たる成長面又はその対面が示されている。 Specifically, the angle between the off direction of the seed substrate and the ridge line of the seed substrate will be described with reference to the schematic diagram shown in FIG. FIG. 1 is a plan view when two of the above-described single crystal diamond seed substrates are arranged, and shows a main growth surface or its opposite surface.
ここで、図２の（Ａ）において示されるように、該種基板のオフ方向と該種基板の稜線のなす角度はΘにて表され、本発明ではこの角度が１７度より大きく、９０度以下である。 Here, as shown in FIG. 2A, the angle formed between the off direction of the seed substrate and the ridge line of the seed substrate is represented by Θ, and in the present invention, this angle is larger than 17 degrees and 90 degrees. It is as follows.
（Ａ）及び（Ｂ）共に、同一の結晶学的性質を有する種基板を示している。したがって、図示されるように、各子基板のオフ方向は一致する、即ち平行となる（Ｃ）。この点において、本発明の工程（２）に従って載置された複数の単結晶ダイヤモンド種基板全体は、同一のオフ方向、即ち結晶学的性質を有することになる。 Both (A) and (B) show seed substrates having the same crystallographic properties. Therefore, as shown in the drawing, the off-directions of the respective sub-boards coincide, that is, are parallel (C). In this respect, the entire plurality of single crystal diamond seed substrates placed according to step (2) of the present invention will have the same off-direction, i.e., crystallographic properties.
なお、上述の整形加工された単結晶ダイヤモンド種基板において、整形加工された外周側面に平行な側面を有している場合は、その平行な側面同士、又は前記整形加工された外周側面と、該側面に平行な側面を接触させてもよい。 In addition, in the above-mentioned shaped single crystal diamond seed substrate, when having a side surface parallel to the shaped outer peripheral side surface, the parallel side surfaces or the shaped outer peripheral side surface, A side surface parallel to the side surface may be contacted.
＜工程２について＞
本発明に係る製造方法における工程２は、上記（１）工程で支持台上に載置された複数の種基板の主たる成長面上に単結晶ダイヤモンドを成長させる工程である。
<About step 2>
Step 2 in the manufacturing method according to the present invention is a step of growing single-crystal diamond on the main growth surfaces of the plurality of seed substrates placed on the support base in the step (1).
この工程によって、複数のダイヤモンド種基板は接合される。また、接合された種基板上に、種基板上にダイヤモンド結晶の層が形成される（図２）。斯かる層の結晶学的性質は、複数の種基板の結晶学的性質と同一となる。 By this process, the plurality of diamond seed substrates are bonded. In addition, a diamond crystal layer is formed on the seed substrate that has been joined (FIG. 2). The crystallographic properties of such a layer are the same as the crystallographic properties of the plurality of seed substrates.
単結晶ダイヤモンドを成長させる方法は、特に限定されないが、例えば気相合成法が挙げられる。気相合成法については特に限定されることはなく、例えば、マイクロ波プラズマＣＶＤ法、熱フィラメント法、直流放電法等の公知の方法を適用できる。 The method for growing the single crystal diamond is not particularly limited, and examples thereof include a vapor phase synthesis method. The vapor phase synthesis method is not particularly limited, and for example, a known method such as a microwave plasma CVD method, a hot filament method, a direct current discharge method, or the like can be applied.
特に、マイクロ波プラズマＣＶＤ法によれば、高純度なダイヤモンド単結晶膜を成長させることができる。具体的な製造条件については特に限定はなく、公知の条件に従って、ダイヤモンド単結晶を成長させればよい。原料ガスとしては、例えば、メタンガスと水素ガスの混合ガスを用いることができる。具体的なダイヤモンド成長条件の一例を示すと、反応ガスとして用いる水素及びメタンの混合気体では、メタンは、水素供給量１モルに対して、０．０１〜０．３３モル程度となる比率で供給することが好ましい。また、プラズマＣＶＤ装置内の圧力は、通常、１３．３〜４０ｋＰａ程度とすればよい。マイクロ波としては、通常、２．４５ＧＨｚ、９１５ＭＨｚ等の工業および科学用に許可された周波数のマイクロ波が使用される。マイクロ波電力は、特に限定的ではないが、通常、０．５〜５ｋＷ程度とればよい。この様な範囲内において、例えば、基板（単結晶ダイヤモンド子基板）の温度が９００〜１３００℃程度、好ましくは９００〜１１００℃程度となるように各条件を設定すればよい。 In particular, according to the microwave plasma CVD method, a high-purity diamond single crystal film can be grown. Specific manufacturing conditions are not particularly limited, and a diamond single crystal may be grown according to known conditions. As the source gas, for example, a mixed gas of methane gas and hydrogen gas can be used. As an example of specific diamond growth conditions, in a mixed gas of hydrogen and methane used as a reaction gas, methane is supplied at a ratio of about 0.01 to 0.33 mol with respect to 1 mol of hydrogen supply. It is preferable to do. Moreover, what is necessary is just to usually set the pressure in a plasma CVD apparatus to about 13.3-40 kPa. As the microwave, a microwave having a frequency permitted for industrial and scientific use such as 2.45 GHz and 915 MHz is usually used. The microwave power is not particularly limited, but is usually about 0.5 to 5 kW. Within such a range, for example, each condition may be set so that the temperature of the substrate (single crystal diamond substrate) is about 900 to 1300 ° C., preferably about 900 to 1100 ° C.
成長する単結晶ダイヤモンドの厚さについても特に限定はなく、各子基板間が十分に接合される厚さとすればよく、例えば、１００〜１０００μｍ程度とすることができる。 There is no particular limitation on the thickness of the single crystal diamond to be grown, and it may be set to a thickness at which each of the sub-substrates is sufficiently joined. For example, the thickness can be about 100 to 1000 μm.
なお、複数の種基板の厚さが不均一で、同一とみなすことができない場合、複数の種基板上に単結晶ダイヤモンド基板を成長させて、各々を接合させた後に、斯かる接合後の基板を反転させて、更に単結晶ダイヤモンドを成長させる方法を採用してもよい。反転後の単結晶ダイヤモンドを成長させる方法は、上述の方法を適宜採用すればよい。 In addition, when the thickness of the plurality of seed substrates is not uniform and cannot be regarded as the same, after growing a single crystal diamond substrate on the plurality of seed substrates and bonding each of them, the substrate after such bonding Alternatively, a method of growing single crystal diamond by reversing the above may be adopted. As a method for growing the single crystal diamond after inversion, the above-described method may be adopted as appropriate.
単結晶ダイヤモンド基板
本発明の方法によって製造されるダイヤモンド基板は、均一な結晶学的性質を有する。結晶学的性質とは、上述のとおりである。
Single crystal diamond substrate The diamond substrate produced by the method of the present invention has uniform crystallographic properties. The crystallographic properties are as described above.
具体的には、単結晶ダイヤモンド基板の接合領域上におけるラマンシフトの半値幅は、０ｃｍ−１より大きく１０ｃｍ−１である。 Specifically, the half-value width of the Raman shift on the junction region of the single crystal diamond substrate is larger 10 cm -1 than 0 cm -1.
接合領域とは、図２に示すように複数の種基板を並べた際に、側面同士を接触させた領域の上に形成されたダイヤモンド結晶中の位置を意味する。 The bonding region means a position in a diamond crystal formed on a region where side surfaces are in contact with each other when a plurality of seed substrates are arranged as shown in FIG.
また、本発明の方法によって製造される単結晶ダイヤモンド基板の接合領域におけるＸ線のロッキングカーブの半値幅が、０秒より大きく１５０秒以下である。 In addition, the half width of the X-ray rocking curve in the bonding region of the single crystal diamond substrate manufactured by the method of the present invention is greater than 0 seconds and 150 seconds or less.
本発明の方法によって製造される単結晶ダイヤモンド基板の窒素含有量は０ｐｐｍより大きく１００ｐｐｍ以下である。 The nitrogen content of the single crystal diamond substrate produced by the method of the present invention is greater than 0 ppm and not greater than 100 ppm.
なお、本発明の方法によって製造される単結晶ダイヤモンド基板を、上述のような方法を採用して主たる成長面の外周側面を成型加工等に供して、上述した本発明の単結晶ダイヤモンド基板の製造方法における複数の種基板と見なし、適宜、より大面積の単結晶ダイヤモンドを容易に形成することができる。 In addition, the single crystal diamond substrate manufactured by the method of the present invention is subjected to the above-described method and the outer peripheral side surface of the main growth surface is subjected to a molding process or the like to manufacture the above-described single crystal diamond substrate of the present invention. Considering a plurality of seed substrates in the method, a single crystal diamond having a larger area can be easily formed as appropriate.
以下に、本発明をより詳細に説明するための実施例を示す。但し、本発明が実施例の記載に限定されないのは言うまでもない。 Examples for explaining the present invention in more detail are shown below. However, it goes without saying that the present invention is not limited to the description of the examples.
［比較例１］
同一の結晶学的性質を有する、１０ｍｍ角、厚さ０．３ｍｍの単結晶ダイヤモンド（１００）基板４つを側面が互いに接するように並べ、その上へ、市販のマイクロ波プラズマＣＶＤ装置を用いて、マイクロ波パワー５−１０ｋＷ、ガス圧力１０−２０ｋＰａ、水素ガス流量１ｓｌｍ、メタンガス流量０．０３ｓｌｍで単結晶ダイヤモンド膜を成長させた。成長後、当該基板は接合していた。この基板を厚みが０．５ｍｍとなる様、研磨やイオン注入を用いた成長層の一部の分離を施した。
[ Comparative Example 1]
Four 10 mm square and 0.3 mm thick single crystal diamond (100) substrates having the same crystallographic properties are arranged so that the sides are in contact with each other, and a commercially available microwave plasma CVD apparatus is used on the substrates. A single crystal diamond film was grown at a microwave power of 5-10 kW, a gas pressure of 10-20 kPa, a hydrogen gas flow rate of 1 slm, and a methane gas flow rate of 0.03 slm. After growth, the substrate was bonded. The substrate was partly separated by polishing or ion implantation so that the thickness was 0.5 mm.
当該の２０ｍｍ角、厚さ０．５ｍｍの矩形の単結晶ダイヤモンド（１００）基板について、偏光顕微鏡像観察を行い、線状に接合領域が存在することを確認した。同一の基板の研磨された面に対して、Ｘ線回折を用いてオフ方向を評価した結果から、図３ａの様に、先に述べた接合領域の一部とオフ方向とが平行となっていることを確認した。 The rectangular single crystal diamond (100) substrate having a 20 mm square and a thickness of 0.5 mm was observed with a polarizing microscope image, and it was confirmed that a bonding region was present in a linear shape. As a result of evaluating the off direction using the X-ray diffraction with respect to the polished surface of the same substrate, as shown in FIG. I confirmed.
次いで、当該基板上へ、市販のマイクロ波プラズマＣＶＤ装置を用いて、マイクロ波パワー１０ｋＷ、ガス圧力１６ｋＰａ、水素ガス流量１ｓｌｍ、メタンガス流量０．０３ｓｌｍで、該種結晶の研磨された面上に１２時間単結晶ダイヤモンド膜を成長させた。単結晶ダイヤモンドの成長における成長終了時の基板温度は、１２００℃であった。形成された単結晶ダイヤモンド膜の厚さは０．２ｍｍであった。 Next, using a commercially available microwave plasma CVD apparatus on the substrate, a microwave power of 10 kW, a gas pressure of 16 kPa, a hydrogen gas flow rate of 1 slm, and a methane gas flow rate of 0.03 slm are formed on the polished surface of the seed crystal. A single crystal diamond film was grown for a time. The substrate temperature at the end of the growth of single crystal diamond was 1200 ° C. The formed single crystal diamond film had a thickness of 0.2 mm.
合成後の試料表面を微分干渉顕微鏡により観察したところ、図４ａに示す様に、接合領域上で、表面形状が非一様性を生じていることが判った。また、Ｒａｍａｎ分光計測を用いて当該領域の結晶性を評価すると、図５ａに示す様に、当該領域上でのＲａｍａｎスペクトルの半値幅が、その領域から０．２ｍｍ離れた場所での半値幅の１．５倍程度になり、結晶性が劣化していることを示唆する結果が得られた。 When the surface of the sample after synthesis was observed with a differential interference microscope, it was found that the surface shape was non-uniform on the bonding region as shown in FIG. 4a. Further, when the crystallinity of the region is evaluated using Raman spectroscopic measurement, as shown in FIG. 5a, the half width of the Raman spectrum on the region is the half width at a location 0.2 mm away from the region. The result was about 1.5 times, and a result suggesting that the crystallinity was deteriorated was obtained.
［比較例２］
同一の結晶学的性質を有する、１０ｍｍ角、厚さ０．２ｍｍの単結晶ダイヤモンド（１００）基板４つを、互いに設置する様に配置し、これらの基板上へ、市販のマイクロ波プラズマＣＶＤ装置を用いて、マイクロ波パワー５−１０ｋＷ、ガス圧力１０−２０ｋＰａ、水素ガス流量１ｓｌｍ、メタンガス流量０．０３ｓｌｍで単結晶ダイヤモンド膜を成長させた。成長後、当該基板は接合していた。この基板を厚みが０．５ｍｍとなる様、研磨やイオン注入を用いた成長層の一部の分離を施した。
[ Comparative Example 2]
Four 10 mm square and 0.2 mm thick single crystal diamond (100) substrates having the same crystallographic properties are arranged so as to be placed on each other, and a commercially available microwave plasma CVD apparatus is placed on these substrates. Was used to grow a single crystal diamond film at a microwave power of 5-10 kW, a gas pressure of 10-20 kPa, a hydrogen gas flow rate of 1 slm, and a methane gas flow rate of 0.03 slm. After growth, the substrate was bonded. The substrate was partly separated by polishing or ion implantation so that the thickness was 0.5 mm.
当該の２０ｍｍ角、厚さ０．５ｍｍの矩形の単結晶ダイヤモンド（１００）基板について、偏光顕微鏡像観察を行い、線状に接合領域が存在することを確認した。同一の基板の研磨された面に対して、Ｘ線回折を用いてオフ方向を評価した結果から、図３ｂの様に、接合領域とオフ方向とが１７°の角度を成すことを確認した。 The rectangular single crystal diamond (100) substrate having a 20 mm square and a thickness of 0.5 mm was observed with a polarizing microscope image, and it was confirmed that a bonding region was present in a linear shape. From the result of evaluating the off direction using the X-ray diffraction with respect to the polished surface of the same substrate, it was confirmed that the bonding region and the off direction formed an angle of 17 ° as shown in FIG. 3b.
次いで、当該基板上へ、市販のマイクロ波プラズマＣＶＤ装置を用いて、マイクロ波パワー１０ｋＷ、ガス圧力１６ｋＰａ、水素ガス流量１ｓｌｍ、メタンガス流量０．０３ｓｌｍで、該種結晶の研磨された面上に１３時間単結晶ダイヤモンド膜を成長させた。単結晶ダイヤモンドの成長における成長終了時の基板温度は、１２００℃であった。形成された単結晶ダイヤモンド膜の厚さは０．２ｍｍであった。 Next, using a commercially available microwave plasma CVD apparatus, a microwave power of 10 kW, a gas pressure of 16 kPa, a hydrogen gas flow rate of 1 slm, and a methane gas flow rate of 0.03 slm are formed on the surface of the seed crystal on the substrate. A single crystal diamond film was grown for a time. The substrate temperature at the end of the growth of single crystal diamond was 1200 ° C. The formed single crystal diamond film had a thickness of 0.2 mm.
合成後の試料表面を微分干渉顕微鏡により観察したところ、図４ｂに示す様に、接合領域上で、表面形状が非一様性を生じていることが判った。また、Ｒａｍａｎ分光計測を用いて当該領域の結晶性を評価すると、図５ｂに示す様に、当該領域上でのＲａｍａｎスペクトルの半値幅が、その領域から０．２ｍｍ離れた場所での半値幅の１．５倍程度になり、結晶性が劣化していることを示唆する結果が得られた。 When the surface of the sample after synthesis was observed with a differential interference microscope, it was found that the surface shape was non-uniform on the bonding region as shown in FIG. 4b. Further, when the crystallinity of the region is evaluated using Raman spectroscopic measurement, as shown in FIG. 5b, the half width of the Raman spectrum on the region is the half width at a location 0.2 mm away from the region. The result was about 1.5 times, and a result suggesting that the crystallinity was deteriorated was obtained.
［実施例１］
同一の結晶学的性質を有する、長さ約４０ｍｍ、幅約２０ｍｍ、厚さ０．４ｍｍの不定形の結晶ダイヤモンド（１００）基板２枚についてＸ線回折を用いてオフ方向を評価した結果から、図３ｃの様に、当該基板其々の端部稜線とオフ方向とが３０°の角度を成すことを確認した。
[Example 1 ]
From the results of evaluating the off-direction using X-ray diffraction for two amorphous crystalline diamond (100) substrates having the same crystallographic properties and having a length of about 40 mm, a width of about 20 mm, and a thickness of 0.4 mm, As shown in FIG. 3c, it was confirmed that the edge ridgeline of each of the substrates and the off direction form an angle of 30 °.
次いで、当該２枚の基板を、互いに設置する様に配置し、これらの基板上へ、市販のマイクロ波プラズマＣＶＤ装置を用いて、マイクロ波パワー１０ｋＷ、ガス圧力１４ｋＰａ、水素ガス流量１ｓｌｍ、メタンガス流量０．０３ｓｌｍで、１７時間単結晶ダイヤモンド膜を成長させた。単結晶ダイヤモンドの成長における成長終了時の基板温度は、１２００℃であった。形成された単結晶ダイヤモンド膜の厚さは０．２ｍｍであった。 Next, the two substrates are arranged so as to be installed on each other, and a microwave power of 10 kW, a gas pressure of 14 kPa, a hydrogen gas flow rate of 1 slm, and a methane gas flow rate on these substrates using a commercially available microwave plasma CVD apparatus. A single crystal diamond film was grown at 0.03 slm for 17 hours. The substrate temperature at the end of the growth of single crystal diamond was 1200 ° C. The formed single crystal diamond film had a thickness of 0.2 mm.
合成後の試料表面を微分干渉顕微鏡により観察したところ、図４ｃに示す様に、接合領域上で、表面形状が一様性を保持していることが判った。また、Ｒａｍａｎ分光計測を用いて当該領域の結晶性を評価すると、図５ｃに示す様に、当該領域上でのＲａｍａｎスペクトルの半値幅は、その領域から０．２ｍｍ離れた場所での半値幅と同程度であり、スペクトルの形状も一様である結果が得られた。 When the surface of the sample after synthesis was observed with a differential interference microscope, it was found that the surface shape maintained uniformity on the bonding region as shown in FIG. 4c. Further, when the crystallinity of the region is evaluated using Raman spectroscopic measurement, as shown in FIG. 5c, the half width of the Raman spectrum on the region is the half width at a location 0.2 mm away from the region. The results were similar and the shape of the spectrum was uniform.
［実施例２］
同一の結晶学的性質を有する、１０ｍｍ角、厚さ０．２ｍｍの単結晶ダイヤモンド（１００）基板４つを、互いに設置する様に配置し、これらの基板上へ、市販のマイクロ波プラズマＣＶＤ装置を用いて、マイクロ波パワー５−１０ｋＷ、ガス圧力１０−２０ｋＰａ、水素ガス流量１ｓｌｍ、メタンガス流量０．０３ｓｌｍで単結晶ダイヤモンド膜を成長させた。成長後、当該基板は接合していた。この基板を厚みが０．５ｍｍとなる様、研磨やイオン注入を用いた成長層の一部の分離を施した。
[Example 2 ]
Four 10 mm square and 0.2 mm thick single crystal diamond (100) substrates having the same crystallographic properties are arranged so as to be placed on each other, and a commercially available microwave plasma CVD apparatus is placed on these substrates. Was used to grow a single crystal diamond film at a microwave power of 5-10 kW, a gas pressure of 10-20 kPa, a hydrogen gas flow rate of 1 slm, and a methane gas flow rate of 0.03 slm. After growth, the substrate was bonded. The substrate was partly separated by polishing or ion implantation so that the thickness was 0.5 mm.
当該の２０ｍｍ角、厚さ０．５ｍｍの矩形の単結晶ダイヤモンド（１００）基板について、偏光顕微鏡像観察を行い、線状に接合領域が存在することを確認した。同一の基板の研磨された面に対して、Ｘ線回折を用いてオフ方向を評価した結果から、図１ｄの様に、先に述べた接合領域の一部とオフ方向とが垂直となっていることを確認した。 The rectangular single crystal diamond (100) substrate having a 20 mm square and a thickness of 0.5 mm was observed with a polarizing microscope image, and it was confirmed that a bonding region was present in a linear shape. From the result of evaluating the off direction using X-ray diffraction with respect to the polished surface of the same substrate, as shown in FIG. 1d, a part of the bonding region described above and the off direction are perpendicular to each other. I confirmed.
次いで、当該基板上へ、市販のマイクロ波プラズマＣＶＤ装置を用いて、マイクロ波パワー１０ｋＷ、ガス圧力１６ｋＰａ、水素ガス流量１ｓｌｍ、メタンガス流量０．０３ｓｌｍで、該種結晶の研磨された面上に１２時間単結晶ダイヤモンド膜を成長させた。単結晶ダイヤモンドの成長における成長終了時の基板温度は、１２００℃であった。形成された単結晶ダイヤモンド膜の厚さは０．２ｍｍであった。 Next, using a commercially available microwave plasma CVD apparatus on the substrate, a microwave power of 10 kW, a gas pressure of 16 kPa, a hydrogen gas flow rate of 1 slm, and a methane gas flow rate of 0.03 slm are formed on the polished surface of the seed crystal. A single crystal diamond film was grown for a time. The substrate temperature at the end of the growth of single crystal diamond was 1200 ° C. The formed single crystal diamond film had a thickness of 0.2 mm.
合成後の試料表面を微分干渉顕微鏡により観察したところ、図２ｄに示す様に、接合領域上で、表面形状が一様性を保持していることが判った。また、Ｒａｍａｎ分光計測を用いて当該領域の結晶性を評価すると、図３ｄに示す様に、当該領域上でのＲａｍａｎスペクトルの半値幅は、その領域から０．２ｍｍ離れた場所での半値幅と同程度であり、スペクトルの形状も一様である結果が得られた。 When the surface of the sample after synthesis was observed with a differential interference microscope, it was found that the surface shape maintained uniformity on the bonding region as shown in FIG. 2d. Further, when the crystallinity of the region is evaluated using Raman spectroscopic measurement, as shown in FIG. 3d, the half width of the Raman spectrum on the region is the half width at a location 0.2 mm away from the region. The results were similar and the shape of the spectrum was uniform.
Claims (5)
（１）同一の結晶学的性質を有する複数の単結晶ダイヤモンド種基板であって、該種基板のオフ方向と該種基板の稜線のなす角が３０度以上、９０度以下（但し、＜１００＞方向の稜線と＜０１０＞方向の稜線との両方の稜線と前記オフ方向とのなす角が４５度である場合を除く。）となるように該種基板の主たる成長面の外周側面が整形加工された複数の種基板を、支持台上に、互いの整形加工された該種基板の側面同士が接触し、該種基板のオフ方向を一致させ、且つ該種基板の主たる成長面が露出する状態となるように載置する工程、
（２）上記（１）工程で支持台上に載置された複数の種基板の主たる成長面上に単結晶ダイヤモンドを成長させる工程。 A method for producing a single crystal diamond substrate including the following steps:
(1) A plurality of single crystal diamond seed substrates having the same crystallographic properties, wherein an angle formed by an off direction of the seed substrate and a ridge line of the seed substrate is not less than 30 degrees and not more than 90 degrees (provided that <100 The outer peripheral side surface of the main growth surface of the seed substrate is shaped so that the angle formed by both the ridge line of the> direction and the ridge line of the <010> direction and the off direction is 45 degrees. A plurality of processed seed substrates are brought into contact with each other on the support table so that the side surfaces of the shaped substrates are in contact with each other, the off-directions of the seed substrates are matched, and the main growth surface of the seed substrate is exposed. A process of placing the product so that
(2) A step of growing single crystal diamond on a main growth surface of a plurality of seed substrates placed on a support base in the step (1).
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